Gladon CLJR5012B 2-Piece Premium Swimming Pool Cover with Securing System;

Cover Lock JR's are designed to last for years and consist of interlocking 5 inch long male and female parts made with a flexible, UV stabilized resin. Male cover lock JR's are snapped onto a pools top rails and female cover lock JR's snap over the cover onto the male parts. This two-piece design offers more holding power than any other cover clip. Installation is a snap. Just install a minimum of three male cover lock JR's per top rail. Next, place the cover over the pool and top rails. Finally, snap female cover lock JR's over the cover onto the male pieces. Just pull on the excess cover material to remove female cover locks.